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UNIVERSITY OF TEXAS AT PERMIAN BASIN PROFILE UNIVERSITY OF TEXAS AT PERMIAN BASIN This facility is a 3-story classroom structure with a 115,000 square foot Plaza Deck which wraps around the two (2) building structures. The facility has had water infiltration problems from the Plaza Deck since it was constructed.
Problems:
1. The sixty (60) mil thick preformed sheet waterproofing membrane was installed over rigid insulation which was spot adhered to the deck.
2. Expansion joints and transitions in the Plaza Deck System were improperly done.
3. The drains for the deck surface water and water under the concrete topping are three (3) inch drains which are cast into the center of the concrete column support structure. Many of them were plugged and some were abandoned with concrete topping poured over them.
Type of original/existing waterproofing system:
Deck: Cast-in-place concrete structure.
Plaza System: Concrete topping slab, preformed sheet waterproofing, and protection board installed over rigid insulation spot adhered to the structural concrete deck.
Consulting services provided:
Evaluation and Design: This project included review of the design Architect's construction documents, associated site conditions, recommendations and details for waterproofing system design and constructability.
Contract Administration: Services included evaluation of existing conditions, design, installation details, technical specifications, pre-bid conference, bid analysis, submittal review, pre-construction meeting, project meetings, review of change order requests, recommendations for proper treatment of concealed conditions uncovered during demolition and construction and final inspections.
Inspection: Services included periodic on-site quality control inspection of work in progress, repair and installation progress photos, documentation of site conditions, documentation of contract compliance and help with certification of final completion.
Solution:
¨ Existing concrete topping was cut into large sections and lifted with a bobcat onto small trailers pulled by A.T.V. to a storage point off of the Plaza Deck.
¨ The deck was cleaned and primed.
¨ New drains were added where necessary and existing drains were cleaned and flushed to insure proper drainage.
¨ Hot rubberized asphalt waterproofing with polyester reinforcing was utilized as the new waterproofing system.
¨ The system was protected with a special modified bitumen sheet.
¨ Sections were flooded and left for a minimum of 24 hours to test for leakage.
¨ A continuous composite drain structure was installed to insure positive drainage at the deck level.
¨ One (1) inch rigid polystyrene insulation was installed over the composite drain structure.
¨ The insulation was protected from fines and debris with an additional filter fabric.
¨ New exposed aggregate precast pavers were then installed over a pedestal support system.
¨ A 3/16 inch joint between pavers allowed all surface moisture to migrate down to the deck level to drain away.
¨ The UTPB logo was incorporated into the deck paving system using special finished pavers with different exposed aggregate finishes.
Factors which determined the selection of new waterproofing system:
¨ Twenty-five (25) year complete system warranty.
¨ Ease of repair.
¨ Anticipated facility usage.
¨ Long term maintenance.
¨ Appearance and function of systems.
Actual Start Date: October, 1995 Actual Completion Date: May, 1996 Budget: $2,000,000 Actual Cost: $1,877,000
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